Cooled nozzle for fuel valves in internal combustion engines



Sept. 27, 1932. UMME 1,879,985

COOLED NOZZLE FOR FUEL VALVES IN INTERNAL COMBUSTION ENGINES Filed April 6. 1929 the Patented Sept. 27, 1932 UNITED STATES HANS LfiMMEN, 0F COLOGNE-DEUTZ-ON-THE-RHINE, GERMANY,

PATENT OFFICE ASSIGNOR TO MOTOR- COOLED NOZZLE FOR. FUEL VALVES Application filed April 6, 1929, Serial No.

The present invention relates to a watercooled nozzle for the fuel valves of internal combustion engines.

The invention, which has among its objects provision of a water-cooled nozzle of improved construction in which the nozzle tip is eifectively cooled, will be best understood from the following description when read in the light of the accompanying drawing of one embodiment of the invention, the

scope of which latter will be more particularly pointed out in the appended claims.

In the drawing Fig. l is a longitudinal section on the line A-B of Fig. 2 of a nozzle constructed according to the invention;

F Fig. 2 is a section on the line 0-D of ig'. l

Fig.3 is a plan of the nozzle tip; and

Figs. 3a and 4 are respectively sections on the lines GI-I and E-F of Fig. 3. i

In the drawing a designates the lower part of the cylinder cover, I; the lower end of valve casing with the cooling water supply passage 0 and the cooling water discharge passage (Z. The top sur ace of the nozzle tip e has been ground into the bottom face of the valve casing 22, which is firmly pressed upon the former by means of the nut in such a manner that the oil chamber 9, W ich is supplied by the pipe line it and the passages h, is tightly closed towards the water chamber 2'.

The fuel needle valve is is guided by the sleeve Z of the valve casing 12, and at its lower pointed end cooperates with a seat m at the upper end of the passage 72. formed in the nozzle tip, the needle by this construction being adapted to control the pasasge of fuel through the spray openings 0.

As shown, the nozzle tip e is provided with an annular water jacket chamber 8 surrounding the passage n and valve seat m, this annular chamber being of reduced diameter at its lower end and extending to adjacent the spray openings 0, while at its upper end it opens on the face of the nozzle tip and communicates with the annular chamber 2' formed in the nozzle body, with which IN INTERNAL COMBUSTION ENGINES 353,089, and in Germany April 18, 1928.

latter chamber the discharge passage 03 in the nozzle body communicates.

Herein, a small bore tube or pipe p places the water jacket chamber 8 of the nozzle tip e in communication with the water supply passage 0, while this chamber is placed in communication with the water discharge passage d .by a similar pipe p, the two pipes communicating with said chamber in closely adjacent relation, as clearly illustrated in Fig. 4. For causing the water to circulate all around the jacket chamber 8, the nozzle tip is herein formed with a recess 1" intersecting the-chamber s between the points of communication therewith of the pipes 19 and p. In this recess is inserted a plug 9 which provides a partition between the aforesaid points of communication, thus enforcing'the water which enters the jacket chamber through the plpep to travel substantially entirely around the acket chamber before it therefrom through the pipe 12 The securing of the nozzle against twisting, when screwing same on or oil by means of the nut f, has been provided for by the two small diameterpipes p-p, which are fixedly mounted-for instance by way of soldering-in the openings of the passage 0 and d at the lower face of the valve. casing 12. It Will be understood that wide deviations may be made from the embodiment of the invention above described without depart ing from the spirit of the invention. claim: i 1. A fuel injection valve for an internal combustion engine having, in combination, a nozzle body portion, a needle valve carried thereby, a one-piece nozzle tip separate from said body portion formed to provide a seat for said valve; said nozzle tip also formed with a cavity for cooling water, which cavity can discharge opens on that surface of said nozzle tip which said body portion and nozzle tip in assembled relation.

2. A fuel injection valve for aninternal combustion engine having, in combination, a nozzle body portion, a needle valve carried thereby, a one-piece nozzle tip separate from said body portion formed with a recess for receiving the end portion of said needle valve, said recess opening on that surface of said 10 nozzle tip which abuts with said nozzle body portion and being formed inwardly of said surface with a seat for said valve; said nozzle tip being also formed with an annular frustoconical cavity for coolingwater, the large 13 diameter end of which cavity opens on said 1 surface of said nozzle tip, and which cavity surrounds said recess and valve seat; the abutting surfaces of said nozzle tip and body portion being unitary plane surfaces :3 contacting in fluid tight relation at opposite sides of the opening of said cavity, and means including a screw cap for securing said nozzle body, portion andnozzle tip in assembled relation.

25 3. A' fuel injection valve for an internal combustion engine having, in combination, a nozzle body portion, a needle valve carried thereby, a one-piece'nozzle tip separate from said body portion formed with a tapered 3o recess for receiving the end portion of said valve, said recess at its base opening on that surface of said nozzle tip which abuts with said nozzle body portion, and said recess at its apex formed to provide a seat for said 35 valve; said nozzle tip also formed with a small diameter passage extending from said seat to the nozzle tip end, and also formed with an annular frusto-conical cavity for cooling water, which cavity at its large diameter end 40 opens on the same surface of said nozzle tip as said recess, and surrounds said recess, seat and passage, extending to adjacent said nozzle tip'end, the wall separating said cavity from said recess and passage being of generally uniform thickness; the abutting surfaces of said nozzle body portion and nozzle tip being unitary plane surfaces contacting in fluid tight relation at opposite sides of the opening of said cavity, and means including a screw 53 cap for securing said nozzle body portion and nozzle tip in assembled relation.

In testimony whereof, I have signed my name to this specification.

HANS LllMMEN. 

